Who was the best (inca, duh)

The Inca were the best civilization. One reason is because they had miles of paved roads. Something interesting is that the Inca never had the wheel. They had runners deliver verbal messages by foot. The messages were verbal because they had no written language. They also had llamas carry things while walking on the road. Some of the roads can still be seen today. Unlike others, the Inca had no slaves. The Maya and the Aztec both had slaves. Although the Inca took prisoners, they were not slaves. The Inca had no written language, so they used Khipu. Khipu were used to record things. They were made of many smaller things attached to a big string. The Inca tied knots on the smaller strings to record things. The Inca had a huge army. However, you only had to be in the army once. The Inca farmed in a different way from other civilizations. Because they lived on mountains, the Inca had little to no flat ground to farm on. Instead, they dug terraces on the mountainsides. They had an irrigation system that transported water to each terrace, watering the crops(most were potatoes). The Inca, as you have seen,were the best civilization.